import pymysql
def menu():
print("\t\t学生信息管理系统\t\t")
print("\t\t1 添加学生\t\t")
print("\t\t2 删除学生\t\t")
print("\t\t3 修改学生\t\t")
print("\t\t4 按成绩降序排序：\t\t")
print("\t\t5 按成绩升序排序：\t\t")
print("\t\t6 查询：\t\t")
print("\t\t7 退出程序\t\t")
passdef insert():
print("插入学生信息")
name = input("请输入学生姓名：")
sex = input("请输入学生性别：")
snum = input("请输入学生学号：")
chinese = int(input("请输入学生语文成绩："))
math = int(input("请输入学生数学成绩："))
stotal = int(input("请输入学生总成绩："))
db = pymysql.connect(host='localhost',
user='root',
password='333',
database='studentdb')
cursor = db.cursor()
sql = "insert into st(sname,ssex,snum,chinese,math,stotal) values('%s','%s','%s',%d,%d,%d)"%(name,sex,snum,chinese,math,stotal)
try:
cursor.execute(sql)
db.commit()
except:
db.rollback()
print("error")
db.close()
passdef delete():
while 1:
print("删除学生信息")
choose1 = int(input("请输入您的删除方式：1 按姓名 2 按学号: "))
if choose1 == 1:
print("按姓名删除")
strname = input("请输入删除学生的名字：")
db = pymysql.connect(host='localhost',
user='root',
password='333',
database='studentdb')
cursor = db.cursor()
sql1 = "select *from st where sname='%s'"%(strname)
cursor.execute(sql1)
if cursor.rowcount>0:
try:
sql = "DELETE FROM st WHERE sname = '%s'" % (strname)
cursor.execute(sql)
db.commit()
print("删除姓名为%s的学生信息成功" % (strname))
break
except:
db.rollback()
print("error")
db.close()
else:
print("没有这个学生的信息，输入错误")
break
elif choose1 == 2:
print("按学号删除")
strnum = input("请输入删除学生的学号：")
db = pymysql.connect(host='localhost',
user='root',
password='333',
database='studentdb')
cursor = db.cursor()
sql1 = "select *from st where snum='%s'"%(strnum)
cursor.execute(sql1)
if cursor.rowcount>0:
sql = "DELETE FROM st WHERE snum = '%s'" % (strnum)
try:
cursor.execute(sql)
db.commit()
print("删除学号为%s学生的信息成功" % (strnum))
break
except:
db.rollback()
print("error")
db.close()
else:
print("没有这个学生的信息，输入错误")
break
else:
print("输入错误，重新输入")
break
pass
pass
passdef change():
while 1:
print("改变学生信息")
myname = input("请输入改变学生的名字:")
db = pymysql.connect(host='localhost',
user='root',
password='333',
database='studentdb')
cursor = db.cursor()
sql1 = "select *from st where sname='%s'"%(myname)
cursor.execute(sql1)
results = cursor.fetchall()
name12='0'
for row in results:
name12 = row[0]
if myname == name12:
try:
sex = input("请输入学生性别：")
snum = input("请输入学生学号：")
chinese = int(input("请输入学生语文成绩："))
math = int(input("请输入学生数学成绩："))
stotal = int(input("请输入学生总成绩："))
#有问题解决不了
sql3 = "update st set ssex ='%s',snum='%s',chinese=%d,math=%d,stotal=%d where sname='%s'"%(sex,snum,chinese,math,stotal,name12)
cursor.execute(sql3)
db.commit()
print("修改姓名为%s学生的信息成功"%(myname))
break
except:
db.rollback()
print("error")
db.close()
break
else:
print("没有这个学生的信息，输入错误")
break
pass
pass
passdef sortbyscoredesc():
print("按成绩降序")
db = pymysql.connect(host='localhost',
user='root',
password='333',
database='studentdb')
cursor = db.cursor()
sql = "select * from st order by stotal desc"
try:
cursor.execute(sql)
results = cursor.fetchall()
for row in results:
name1 = row[0]
sex1 = row[1]
num1 = row[2]
chinses1 = row[3]
math1 = row[4]
total1 = row[5]
# 打印结果
print("学生姓名:%s\t,学生性别:%s\t,学生学号:%s\t,语文成绩:%d\t,数学成绩:%d\t,总成绩:%d\t" % \
(name1, sex1, num1, chinses1, math1, total1))
db.commit()
except:
db.rollback()
print("error")
db.close()
passdef sortbyscore():
print("按成绩升序排序")
db = pymysql.connect(host='localhost',
user='root',
password='333',
database='studentdb')
cursor = db.cursor()
sql = "select * from st order by stotal asc "
try:
cursor.execute(sql)
results = cursor.fetchall()
for row in results:
name1 = row[0]
sex1 = row[1]
num1 = row[2]
chinses1 = row[3]
math1 = row[4]
total1 = row[5]
# 打印结果
print("[农产品期货](https://www.gendan5.com/cf/af.html)学生姓名:%s\t,学生性别:%s\t,学生学号:%s\t,语文成绩:%d\t,数学成绩:%d\t,总成绩:%d\t" % \
(name1, sex1, num1, chinses1, math1, total1))
db.commit()
except:
db.rollback()
print("error")
db.close()
passdef select():
print("查询学生信息")
db = pymysql.connect(host='localhost',user='root',password='333',database='studentdb')
cursor = db.cursor()
sql = "select * from st"
try:
cursor.execute(sql)
results = cursor.fetchall()
for row in results:
name1 = row[0]
sex1 = row[1]
num1 = row[2]
chinses1 = row[3]
math1 = row[4]
total1 = row[5]
# 打印结果
print("学生姓名:%s\t,学生性别:%s\t,学生学号:%s\t,语文成绩:%d\t,数学成绩:%d\t,总成绩:%d\t" % \
(name1,sex1,num1,chinses1,math1,total1))
db.commit()
except:
db.rollback()
print("error")
db.close()
passdef exitexe():
while 1:
print("确定要退出系统吗？退出(y) 不退出(n)")
c = input("请输入您的选择aaaa：\t")
if c == 'y':
exit()
elif c == 'n':
break
else:
print("输入有误 重新输入")
pass
passif name == '__main__':
while True:
menu()
choose = int(input("请输入您的选择:\t"))
if choose == 1:
insert()
elif choose == 2:
delete()
elif choose == 3:
change()
elif choose == 4:
sortbyscoredesc()
elif choose == 5:
sortbyscore()
elif choose == 6:
select()
elif choose == 7:
exitexe()
pass
pass